near duluth, minnesota, nearly 3 feet of snow in two days. >> it's going to be a white christmas. >> reporter: the arctic blast burying cars. conditions like these on the roads claiming at least six lives. by friday, it could be 20 degrees belzero. tonight, states are bracing for pockets of record cold. >> we haven't seen anything like this for a while, this early in the season. >> reporter: across much of the west, temperatures could plummet 40 degrees below normal. in denver it went from nearly 60 degrees to 6 in 2001 day, perfect for the polar bear at the zoo, not so ideal for this snowplow. >> you've got icy, snow packed roads. >> reporter: with an army of plows working around the clock, it is all hands on deck to keep the roads clear for the evening commute.